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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de44b46e5cd0d920c3f4d5ad917715b0ad73e9b46923324c0a8bee25c8595063' 
  AND token = 'bPts9rH7t4Z8+xZPa5iEWlM5AfJBxvt5MxVkcEDsZME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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