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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dff18e7de7b2ccb76ac4f8ae94bba4010919b5b1466125fd7a26677805a4e0a' 
  AND token = 'd5eAQqW8VKILpZhx8nhdsXNC9AEqQAQqiLVVpM+n0+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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