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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c18871a2f2753d97602d3b7e7f4b48024f365dfd9457a43f6b76bb14e7cfb91b' 
  AND token = 'Nin83w7MAd8NoVIEl4Ir5ualnjbhT5KovGOkWQvpZLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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