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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40c3b1226d6b3e7d79b6c4f6c9379da9514460a3ab8f3ffacd869901ca5a40be' 
  AND token = 'Bg760jpb3AUeC7qyLb8ueDEqm2RS/RScahhnhSincJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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