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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '487b92d6336c3ddbd284279302c32b7c71df897a24c9d11bf01b1db2e1246757' 
  AND token = '7B3mrtlw9deo/UpsQCbndON9k3C0IWRGkUHtuPbyFNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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