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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fd4190d160504d01ebedc832c3816175f869ae84437b7ac30ac038b6b2b34f1' 
  AND token = '+f7FEwyWzjQ+DseEu4s+FwKVid6mwM8QobtX/wlRpYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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