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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db08efcaa973d3e080590b41a35df40936870a9885347554ea6794d44d679abb' 
  AND token = 'Guiplg1LByDLmvL1N0PXXsrH5ym6BWjzalsZo+QeliU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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