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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5431359edfa34620302839da349b800893085475a5da1ef9c403a3d56bf3e8af' 
  AND token = '56wh6OMvMObWDHmHokrWdL4MUGe04kzrR7xIYOPJ7X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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