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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d301f29cbd389e8e08a051c5cc004541eee59204c8f3796054ec48b276e6b67' 
  AND token = 'jsrUbflU/WGESABY3OR6p0XP1n0TcEGcegFmC1NH78E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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