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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a89023bc38373d60537445aa54fc35d2856344428b0a4df86140f0cd4f5a54bc' 
  AND token = 'idJio9tMSuTA11jjVj/nbQWEHVSW8Qy++oImdemXbCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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