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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55da06904bb39bb4ab07a9a0413af1b9845b2e5d6275d949f62d1091ffe8b645' 
  AND token = 'Zte8VhTVbMTxRaw3c5G7QnFKx0Fiixz04zkBYgtOkxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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