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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e89ec4ad8e84d490cc42956e6f845bb6c489555c3b117ebc59ab40cd276dce9f' 
  AND token = 'Jemy5/pkRPBLvDhZpY+PQEUBmV+n/6gpe0iYEkF48VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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