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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73fedbd59225b0c84e1e939cf536c21899937c9d6bbe8b6f20c3291b0f635eab' 
  AND token = 'L95S/VsQ4L5eCqYSOFDrXnkjzrumy1K685qd6+EZO+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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