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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff5fc4126c4bf1417b0b1adaa7afc5cf1f01edf277cc6c99ec0a9ba2ace23518' 
  AND token = 'WdFojtwTXgayiE55E7cWChEKLG1RlArRPGQsJTo3WyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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