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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e676f87f14004bbefb6a15d78a9de757b3ee8ab8b2dbb56efd51349a563a4217' 
  AND token = 'YhGRrfpXKeWavOoOfnVn7VmSDdtAg6CYyEIQKIMhlek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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