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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0f0a98b8d53ef8914c9c46e039ece24ed4a28d043db4c4a4c37ddddf2ec1a43' 
  AND token = 'LT8Kbs1SNc3eIfoYHqqMf3gbLeCXL9Y4+XF3TYip8lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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