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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '246275e8af23053e34f9e8732ac4338bc7ac5fa65a3951d2999b51edc2f1c72f' 
  AND token = 'G7QyQiVvCmYdeXwumwx6TTDERYPLamagN5OjXStbp8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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