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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bae7cc640e8c7d30531664763f5ad4c1b5f48d7c60c5d9124954e264cd1bce8' 
  AND token = 'CwwN1C2nmDVTVz31JMPnCxtGFf1XN31iiMDQewDa8xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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