Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e163e3a1316c2c06df4a7b945ad6f0c4bbc5e53c3bc96fd5ed5e86eff61b571' 
  AND token = 'w3ht9X7RIP3JgAqdKL04FlMmKJnoNXCjkzkEhA5E5iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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