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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31797c573cccb27acf84a9801cf0cc90cd7fb7786a34dd4345b0f0f8f15b8813' 
  AND token = '9ANhpQFJo5SbYAZclsCao2e138pZ5SVVkal3tulnTnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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