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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19caf7a7f31da73ad2d4257428950675cb4d0669e876d64dcc174daea865e0ce' 
  AND token = 'esxmJeyxVHA17dqX0wV17FT73w3E4mACuUrkJz8jcgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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