SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eeb8c5d2cde7fb0472f0f7c7d2ce86b2e6b37826461a82fbea482501b6fd19d' 
  AND token = 'aPzmyiBRQF4bgvb1d3WjmJ8VKnBGkT9PRvSh9qRQWw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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