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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a61d95bcd501ffa4b69ee077a2af5dd9fccbc8b64204f53df4c8bd31311b503' 
  AND token = '5OuP0xQ5r6E3ZbXSHkRY0UQwzeBIBxATBSJxnngSXK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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