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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fe3730922f06c3978135c5d88fee48870d7d1030f8d9b3de0918531dd15d920' 
  AND token = '9nju8ED3OHCZJ/WbWGd4T8c+n37VIV0GlXGotIai4UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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