Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '849c3187ad8a4bffa0761c002b3047d979fe8b6a39583a9e24e4849e2c0cf148' 
  AND token = 'R5f7bu1YGWbn81X8igXxispqesANPXvPYPfzOMkSNZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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