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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aced360f0ce4b8f8c0b671390dcb5e2da7e6daff0c5cd6b63b0d90e258dae1c2' 
  AND token = 'vDt4KLj9d3oSPmdq8eDGz+qoobAzFuDkCdVFqbkaZrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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