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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c4ed4b8c0fa1c97fd9f83643e54c5ba063eaf0b63cf8e5c35236248f67bf79a' 
  AND token = '3WOxsbTY5fmbIz2ZSpGcQzraGwES4IrYaywAd/jTsyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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