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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c287fd11d8448391c58da8ffa614ca92bb8638281f0f9a2915777bd4c7e0b1e9' 
  AND token = 'hn9ivJhvVIEL4I10tcOiYpONsQRJbcliOV7mFxu8Ruw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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