SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4026e05025f065c3b4cba3206c82e271679970f1a8bd4c9d4908d6fba9766752' 
  AND token = '+OCFnDT7sgK+BkmPUFD4Y4yuigT1K6oNxnUJtqYpiR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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