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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c079254cc745f1828eade6788ebc058882873e4c95e7504a24f49a6e8a12fb0d' 
  AND token = 'b1OAUVq6MrpGTsYoWoq2hPDc/SFbv+SIYDNlasXXVcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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