SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1086f05baf3679cbbc7d19ade182170052f068089463a4bf656ab0498c9fcb73' 
  AND token = '+HKnDPiFb/g+JFq5YZP2RLjkb4rXVvdqrB8GJEWPrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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