SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73c54637869dfe725e14b10757f1e2e6180d70dd48f0829c8a64832ad1c2eb7c' 
  AND token = '0S9VYNkuFByC2+LCNWzGadzvpxyB/hunILb00Tip7fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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