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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a534d36b699e5d0d50bc4c4dbc11765238a392f7481749144807700a46456a1' 
  AND token = '/i0hf/tiatSc9YLaPs4wpv1jJs14/57C8FcPVYn1Vf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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