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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99d23e8e505599f0e372903244ae08860c7a3aa3dfc6a067ccfb318a8e75cb74' 
  AND token = 'RK8vtVlgr8sLFJRaSOxCcd+lOF2UbPOZGwq1PvRaycI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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