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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c334503b76d8eb7b22a481f0da680a4f1bf3ff00a96e68c876a1ad951efa209d' 
  AND token = 'clIj6FETefRnpkWaJuhlgcR/b9SXRsKVwfyZXJ0BwbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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