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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83197515916d375defcc2fa9edab43ec0097f1e2e2067c75fb4a78f892802ca6' 
  AND token = 'P7kEL4s3jN0sjMA1qhfnX2OQNOK++pJPxjA86T2fg+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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