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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c377d1bde2b6bf25f09f86009c64a6daf03ffd28f5f15d8a36a5bbcd097012d7' 
  AND token = 'ZpkThZg6iSn2awWMZXm5SDq7idmP9DSqsFlxJ+012/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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