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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3312d7db96e774dd7e63dff716838ee2c0b04d752faa73157f61968428cfe4c3' 
  AND token = 'EABgtHoZB0L+InZSTg6s/n2NKnt39C6MywBB6WQXuO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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