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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f4647a4fa19e9ea562e3c50e100041581dc5ac0e1c4710700a0341ed97ea21a' 
  AND token = '5d1851KDUDrsJvFdyUpZg1Wed+DhZ5/KEydHXtSVjS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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