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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc778fd747b8539cfbe7291d7a48e7e36314a32502b998484f465931f70baf19' 
  AND token = 'DxvVTBwNP5knf9DrS40+55T2HpS2d8q6Iegt/t2fUmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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