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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce23db23225ad60264e066a43a71ac2a15e282eda6a1672aa2296280c9d6437' 
  AND token = 'd3owT5dl8pjEWo1y2vsOmU0JHKGIXTqTYnQCV1rCjmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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