SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '001fa8858eab249829d929ab4bc856585fdfe8a2b1f4cf385196b15ae170dc23' 
  AND token = 'HEfsG/RqYKjmMv7jlXuZ9q4blBKId8xWYUSOdqrKEds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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