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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd54eedf16fdca4ee4ac641671dfe2c1b6a9c0ba57c36b194175c30aa98887d22' 
  AND token = 'bh5lLUMBHfnXBRV1KrHWSNSN2krX7TGb4vMTtg8v2mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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