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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d693b636d2ed997cadecbff2184fdfdfd7b2a25b31b57aea0ba9588dc0820e2' 
  AND token = '4q2OoV3DIcoOO/ahgLQtBRu1gucKOKibM60FQq3pVJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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