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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f8192e1c0b68fe459e3668329688a1e7d5c58fc3e92a23e630ec9e1dcab2a0f' 
  AND token = '66gomC58gnNicP3VZac5iz/8thKqpZqZdgtI4HrBjiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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