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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16592f03ec6fb447acbb5f538ee0815eca4a093bb3c567edb22cf451d18f3e66' 
  AND token = 'dWaNBc5/3AAQmfjiHXNV9VG5qlQTPXT5Ge+xjW4j2vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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