SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bab8300bf2c9d83c0f0d465c5fd466ef53d4cfdb2bfc527c1ae05d7214c0f34' 
  AND token = 'Paj2EwmvD4TXcXISQl1q88YKh6D+nMS3z2UREJx4hxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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