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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '968421293347fd757023e2bbf3bca5eb7eb14c21f6c33d7cb6d9903de0775616' 
  AND token = '02qnPIR+BuNwYb9UZ6M+jUbes9L3ynT1v9aLc/RrEl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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