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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c33aa00282051c7e9eceae39ee27a9732bf857cd07eaee31679e03f0496abed' 
  AND token = 'HNPAhdqSoZ7v1El2ScgIQ+VFpl9t0+g8eYRq4/Y5ri8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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