SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '283c4f6c09d96e7bbc47ce6fa935a27d2f456e7ad05a22d738ff013ccd022379' 
  AND token = 'dmp3/Sf+D+w1gwpkYPGf28m7K1zGKaTMzJHNgklWSJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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