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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd47f2c3cdee7d3a138b465d3bb2b8c1b5b90b4e0a06397e73b6d6f36b889a43e' 
  AND token = 'HhVJ2RzNSU4UKXZ889NhYAaRApMe0S2wcDwoCLRHWZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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