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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeab79ef0e2c8e1674dd71f41d25949bcde934051319b572c30656ca7d33e797' 
  AND token = 'g8ikZoKxzeFvau2TLxt41jyGWgSGi7h0HAEKKV45PlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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