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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d987ac545536401404e437d6b5d4f1c773f7c1d21e1ceb727d650dd82d3f685' 
  AND token = 'aqew6ZdkkJqYI7gnBQg6Qj49PeluNcPP62HW8dfgCYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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