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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35443fa0c06927b9b347522d7b8f2f65967287c5e541734d9fd7a3f9551df3c9' 
  AND token = 'fCU9i7hRZS9SUU5PBDvotkBuHgLz5xBbemyY7ksOnSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}