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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e79dec332c4b768121d6ab5f7189b10271f8c36d08a516abab3834c8dcd54dcc' 
  AND token = 'ySHxc3tB/JO6lnHCFk5pla5/sxlLikkwDQLo45PS1S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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