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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c714d63cda7472be3378a9b1bb0d0af30ac70ff3f19050aa44c422fd14c4afdf' 
  AND token = 'nGgEm1i1NnEtrdLjj4kiFJBLX54NJ7+QR4uBrI80gHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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