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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '292920c04d2896224bf009d1e2bc2bd241751a0c51b5407f85b8dc353a91acb7' 
  AND token = 'ppqSTZeYl8V47lc8qsmh/iE0YD8cf6XXJTL1oDV43Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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