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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecce586197261615fccc30f3836eadf1be506d88d32d82251233244396ac2be0' 
  AND token = 'MPW7yn4MyGeaC4wOijOUcDin2x6pPUwnug6qGE26MLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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