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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df3a4d154f84d7c480c0ae82da02f0242b334901ae31f1953908db3137142cbf' 
  AND token = 'vgq3Y7bjHkxla41v3uYBn9yLzXfm0xhiFNseJ/r9l68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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