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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84515032847a12f5e92bdc323fc140b6eca244cd1f8280b9cfdcc2cbd4075de1' 
  AND token = 'D2P2OHNs8EH2mq44hdy6yaxy+lSkbdbeHe5Z6IjfsQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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